Car infotainment

Before it was called infotainment, it was standardized. Your vehicle had either a DIN or double-DIN sized deck and replacing it meant getting a new deck in the right size and the wiring harness for your vehicle.

Now, every vehicle uses their own specific sized HMI, the computer(s) driving that is buried somewhere else in the vehicle, and it’s so tightly coupled to the car’s specific CAN/ethernet interfaces using signalling that’s only somewhat standard across manufacturers so even integrating a third-party head unit into all of that would likely mean losing a whole bunch of features.

Most people just use Android Auto/Carplay now anyways